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m68k: mvme147,mvme16x: Don't wipe PCC timer config bits 

Don't clear the timer 1 configuration bits when clearing the interrupt flag
and counter overflow. As Michael reported, "This results in no timer
interrupts being delivered after the first. Initialization then hangs
in calibrate_delay as the jiffies counter is not updated."

On mvme16x, enable the timer after requesting the irq, consistent with
mvme147.

Cc: Michael Pavone <pavone@retrodev.com>
Fixes: 7529b90d05 ("m68k: mvme147: Handle timer counter overflow")
Fixes: 19999a8b87 ("m68k: mvme16x: Handle timer counter overflow")
Reported-and-tested-by: Michael Pavone <pavone@retrodev.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Link: https://lore.kernel.org/r/4fdaa113db089b8fb607f7dd818479f8cdcc4547.1617089871.git.fthain@telegraphics.com.au
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Finn Thain 2021-03-30 18:37:51 +11:00 committed by Geert Uytterhoeven
parent cbfa72b577
commit 43262178c0
3 changed files with 19 additions and 12 deletions
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3
arch/m68k/include/asm/mvme147hw.h
View File

@ -66,6 +66,9 @@ struct pcc_regs {
#define PCC_INT_ENAB 0x08
#define PCC_TIMER_INT_CLR 0x80
#define PCC_TIMER_TIC_EN 0x01
#define PCC_TIMER_COC_EN 0x02
#define PCC_TIMER_CLR_OVF 0x04
#define PCC_LEVEL_ABORT 0x07

14
arch/m68k/mvme147/config.c
View File

@ -114,8 +114,10 @@ static irqreturn_t mvme147_timer_int (int irq, void *dev_id)
unsigned long flags;
local_irq_save(flags);
m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR;
m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF;
m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
PCC_TIMER_TIC_EN;
m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
PCC_LEVEL_TIMER1;
clk_total += PCC_TIMER_CYCLES;
legacy_timer_tick(1);
local_irq_restore(flags);
@ -133,10 +135,10 @@ void mvme147_sched_init (void)
/* Init the clock with a value */
/* The clock counter increments until 0xFFFF then reloads */
m147_pcc->t1_preload = PCC_TIMER_PRELOAD;
m147_pcc->t1_cntrl = 0x0; /* clear timer */
m147_pcc->t1_cntrl = 0x3; /* start timer */
m147_pcc->t1_int_cntrl = PCC_TIMER_INT_CLR; /* clear pending ints */
m147_pcc->t1_int_cntrl = PCC_INT_ENAB|PCC_LEVEL_TIMER1;
m147_pcc->t1_cntrl = PCC_TIMER_CLR_OVF | PCC_TIMER_COC_EN |
PCC_TIMER_TIC_EN;
m147_pcc->t1_int_cntrl = PCC_INT_ENAB | PCC_TIMER_INT_CLR |
PCC_LEVEL_TIMER1;
clocksource_register_hz(&mvme147_clk, PCC_TIMER_CLOCK_FREQ);
}

14
arch/m68k/mvme16x/config.c
View File

@ -366,6 +366,7 @@ static u32 clk_total;
#define PCCTOVR1_COC_EN 0x02
#define PCCTOVR1_OVR_CLR 0x04
#define PCCTIC1_INT_LEVEL 6
#define PCCTIC1_INT_CLR 0x08
#define PCCTIC1_INT_EN 0x10
@ -374,8 +375,8 @@ static irqreturn_t mvme16x_timer_int (int irq, void *dev_id)
unsigned long flags;
local_irq_save(flags);
out_8(PCCTIC1, in_8(PCCTIC1) | PCCTIC1_INT_CLR);
out_8(PCCTOVR1, PCCTOVR1_OVR_CLR);
out_8(PCCTOVR1, PCCTOVR1_OVR_CLR | PCCTOVR1_TIC_EN | PCCTOVR1_COC_EN);
out_8(PCCTIC1, PCCTIC1_INT_EN | PCCTIC1_INT_CLR | PCCTIC1_INT_LEVEL);
clk_total += PCC_TIMER_CYCLES;
legacy_timer_tick(1);
local_irq_restore(flags);
@ -389,14 +390,15 @@ void mvme16x_sched_init(void)
int irq;
/* Using PCCchip2 or MC2 chip tick timer 1 */
out_be32(PCCTCNT1, 0);
out_be32(PCCTCMP1, PCC_TIMER_CYCLES);
out_8(PCCTOVR1, in_8(PCCTOVR1) | PCCTOVR1_TIC_EN | PCCTOVR1_COC_EN);
out_8(PCCTIC1, PCCTIC1_INT_EN | 6);
if (request_irq(MVME16x_IRQ_TIMER, mvme16x_timer_int, IRQF_TIMER, "timer",
NULL))
panic ("Couldn't register timer int");
out_be32(PCCTCNT1, 0);
out_be32(PCCTCMP1, PCC_TIMER_CYCLES);
out_8(PCCTOVR1, PCCTOVR1_OVR_CLR | PCCTOVR1_TIC_EN | PCCTOVR1_COC_EN);
out_8(PCCTIC1, PCCTIC1_INT_EN | PCCTIC1_INT_CLR | PCCTIC1_INT_LEVEL);
clocksource_register_hz(&mvme16x_clk, PCC_TIMER_CLOCK_FREQ);
if (brdno == 0x0162 || brdno == 0x172)